I think it’s because it’s an unapologetic vertical mouse. Most others are just slanted mice. Note that the furst couple days might be slow because you have to adjust to using your arm that way. I got this one in uni because my wrist just didn’t like being flat, and I used computers a lot. This one matches my resting position really well, and the wrist rest means I’m not sliding the side of my hand all over the desk.